bluetooth: Fix crash when receiving a PropertyChanged with new devices
bluetooth: Fix crash when receiving a PropertyChanged with new devices

This signal is emitted when a previously unknown device connects to
the host, for example, when you receive a connection from a device
that is not already paired.

pk-sam/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk